137 lines
5.9 KiB
Java
137 lines
5.9 KiB
Java
/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8015070
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* @summary Tests for artifacts around the edges of anti-aliased text
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* drawn over translucent background color.
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*/
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import java.awt.Color;
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import java.awt.Font;
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import java.awt.Graphics2D;
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import java.awt.RenderingHints;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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public class AntialiasedTextArtifact {
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/* Image dimensions */
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private static final int TEST_IMAGE_WIDTH = 2800;
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private static final int TEST_IMAGE_HEIGHT = 100;
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private static final String TEST_STRING =
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"The quick brown fox jumps over the lazy dog. 0123456789.";
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/*
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* The artifacts appear when text is drawn ontop of translucent
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* background. In other words, a background with alpha channel.
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* Hence we test the algorithm for image types that contain either
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* straight alpha channel or pre-multiplied alpha channel. In
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* addition we test the images with other common pixel formats.
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*/
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private static final int[] TYPES = {BufferedImage.TYPE_INT_ARGB,
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BufferedImage.TYPE_INT_ARGB_PRE,
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BufferedImage.TYPE_4BYTE_ABGR,
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BufferedImage.TYPE_4BYTE_ABGR_PRE,
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BufferedImage.TYPE_INT_RGB,
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BufferedImage.TYPE_INT_BGR,
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BufferedImage.TYPE_3BYTE_BGR};
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public static void main(String[] args) throws IOException {
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/* Iterate over different image types */
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for (int type : TYPES) {
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BufferedImage testImg = getBufferedImage(type);
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/* Draw anti-aliased string and check for artifacts */
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drawAntialiasedString(testImg);
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checkArtifact(testImg);
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}
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}
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private static BufferedImage getBufferedImage(int imageType) {
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/* Create a Graphics2D object from the given image type */
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BufferedImage image = new BufferedImage(TEST_IMAGE_WIDTH,
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TEST_IMAGE_HEIGHT,
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imageType);
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return image;
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}
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private static void drawAntialiasedString(BufferedImage image) {
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/* Create Graphics2D object */
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Graphics2D graphics = (Graphics2D) image.getGraphics();
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/* Fill the image with translucent color */
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graphics.setColor(new Color(127, 127, 127, 127));
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graphics.fillRect(0, 0, TEST_IMAGE_WIDTH, TEST_IMAGE_HEIGHT);
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/* Drawstring with Antialiasing hint */
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graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
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RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
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Font font = new Font("Verdana" , Font.PLAIN, 60);
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graphics.setFont(font);
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graphics.setColor(new Color(255, 0, 0));
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graphics.drawString(TEST_STRING, 10, 75);
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graphics.dispose();
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}
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private static void checkArtifact(BufferedImage image) throws IOException {
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int componentMask = 0xff;
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int colorThreshold = 200;
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int rowIndex = 0;
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int colIndex = 0;
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/* Loop through every pixel to check for possible artifact */
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for (rowIndex = 0; rowIndex < image.getHeight(); rowIndex++) {
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for (colIndex = 0; colIndex < image.getWidth(); colIndex++) {
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/*
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* API: getRGB(x,y) returns color in INT_ARGB color space.
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* Extract individual color components with a simple mask.
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*/
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int colorValue = image.getRGB(colIndex, rowIndex);
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int colorComponent1 = colorValue & componentMask;
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int colorComponent2 = (colorValue>>8) & componentMask;
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int colorComponent3 = (colorValue>>16) & componentMask;
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/*
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* Artifacts are predominantly a subjective decision based on
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* the quality of the rendered image content. However, in the
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* current use-case, the artifacts around the edges of the anti
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* aliased text appear like spots of white pixels without any
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* relation to the color of foreground text or the background
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* translucent shape.
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*
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* To identify the artifact pixels, each color component from
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* the testImage is compared with a constant threshold. The
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* component threshold has been set based on observation from
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* different experiments on mulitple Java versions.
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*/
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if (colorComponent1 >= colorThreshold
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&& colorComponent2 >= colorThreshold
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&& colorComponent3 >= colorThreshold) {
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/* Artifact has been noticed. Report error. */
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throw new RuntimeException("Test Failed.");
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}
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}
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}
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}
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}
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